Exploring The Cardinality And Selectivity Of SQL Conditions

FROM
	contact c
INNER JOIN
	job j
ON
	(
			c.is_deleted = 0
		AND
			c.id = j.contact_id
		AND
			j.is_deleted = 0
		AND
			j.contact_id = #FORM.contact_id#
		AND
			j.contact_role_id = #ContactRoles.CEO#
		AND
			j.date_started <= NOW()
		AND
			(
					j.date_ended IS NULL
				OR
					j.date_ended > NOW()
			)
	)

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